We usually think of Unintended Consequences as being bad consequences. But sometimes they are good. Consider a device that would undermine an anti-liberty government regulation. A device like a 3D printer, for instance. 3D printers make it possible to “print” a 3D object. Unlike a conventional printer that uses ink to print text or images on a 2D sheet of paper, a 3D printer, like the one demonstrated at the link, uses extruded plastic to construct (print) an actual 3-dimensional object of your design. Some guy recently used a 3D printer to make a receiver for an AR-15 rifle. Reportedly it worked perfectly.
Don’t like a government regulation that bans the sale of certain guns or parts? No problem, just print your own.
Of course, I wouldn’t put it past a committed statist to introduce legislation to ban 3D printers.
Hat tip: Instapundit